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How to Run Open-Source AI Models Locally: A Beginner’s Setup Guide

A practical first-run guide to local AI models: check your computer, install LM Studio or Ollama, download model weights, and start chatting.
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You can run an AI language model on your own computer by installing a local model runner, downloading compatible model weights, and loading them into memory. For a first chat, LM Studio offers a graphical workflow; Ollama is another option, with installers for major desktop platforms and a local API for apps. “Open-source” is not a blanket license: check the terms for the specific model you download.

What you need to know before installing

The runner and the model are separate

A model runner is the application that loads model weights and performs inference. The weights are the files containing the trained model; LM Studio says they are commonly distributed in formats such as .gguf or .safetensors. You choose and download a model, then the runner loads it into memory so you can use it.

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Check memory, storage, and licensing

  • Memory: loading a model allocates RAM for its weights and other parameters. Requirements vary by runner and model. The recommendations below are for LM Studio, not universal minimums for all local AI software.
  • Disk space: model files can be large. Ollama’s Windows documentation says its model storage may range from tens to hundreds of GB, depending on what you download. Plan for the files you actually intend to keep; extra storage is optional, not a requirement for running a model.
  • License: downloadable weights do not automatically mean unrestricted use. LM Studio notes that models are released under different licenses and degrees of openness. Read the selected model’s license and use restrictions, especially before commercial use.
  • Performance: speed depends on your hardware. Ollama cautions that large models can be slow on computers without a strong GPU. Do not assume a particular model will run quickly or well without testing that model on your machine.

Check whether your computer meets LM Studio’s requirements

LM Studio’s current requirements page, accessed in 2026, gives the following platform guidance. These are vendor recommendations and support details, not a guarantee that every model will fit or run at a useful speed.

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Platform LM Studio requirements and recommendations
macOS Apple Silicon M1, M2, M3, or M4; macOS 14.0 or later; 16 GB or more RAM recommended. The documentation says 8 GB may work with smaller models and modest context. Intel Macs are not currently supported.
Windows x64 and Snapdragon X Elite ARM are supported. AVX2 is required on x64. At least 16 GB RAM and 4 GB dedicated VRAM are recommended.
Linux x64 and ARM64 are supported through an AppImage distribution; Ubuntu 20.04 or later is required.

For the latest supported chips, operating systems, and distribution details, check LM Studio’s system requirements before installing.

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Run your first model with LM Studio

This is the more straightforward route if you want to download and chat with a model using a graphical interface.

  1. Confirm compatibility. Check your operating system, processor, RAM, and—on Windows—dedicated GPU memory against LM Studio’s requirements.
  2. Install LM Studio. Get the current application from the official LM Studio guide.
  3. Find and download a model. Open Discover, select a curated model or search the catalog, and download its weights. Review the model’s license and intended use before choosing it.
  4. Load the downloaded model. Open Chat, use the model loader to select the download, and load it. The runner allocates memory for the weights and other parameters; if the model does not load, try a smaller model or free up memory.
  5. Start chatting. Once the model is loaded, send it a prompt in Chat and continue the conversation.

Use Ollama instead

Ollama provides installation options for Windows, macOS, and Linux. Its official download page shows a Windows installer and shell commands for macOS and Linux. Use the current instructions for your platform rather than relying on an old third-party command.

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Windows details

Ollama documents support for Windows 10 version 22H2 or newer. It can be used as an application or from Command Prompt or PowerShell. Model files may take tens to hundreds of GB, depending on the models downloaded. To choose a different model storage location, Windows users can set the OLLAMA_MODELS environment variable; see the Ollama Windows documentation for the current instructions.

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GPU acceleration depends on the hardware and driver path: the Windows documentation specifies NVIDIA driver 551.61 or newer for NVIDIA acceleration and describes AMD ROCm/HIP or Vulkan driver options. Check the current platform and GPU documentation for your exact setup; having a GPU does not by itself guarantee that Ollama will use it.

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Optional: connect an app to Ollama

Ollama’s Windows documentation lists a local API at http://localhost:11434, which can let applications on your computer communicate with the runner. The API is not needed for a first chat. If you are building an integration, use Ollama’s current documentation and examples rather than treating the endpoint as a user-facing chat interface.

Context length is different from model size

Ollama’s FAQ lists a default context window of 4096 tokens and documents ways to override it. Context is the amount of text the model can consider in a request; it is not the size of the model file. Increasing context can change memory use, so leave the default alone unless your task needs a longer conversation or document and your computer has enough memory. See the Ollama FAQ for the available settings.

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Choose a beginner path

If you want to… Start with…
Download a model and chat through a graphical interface LM Studio’s Discover-to-Chat workflow.
Use command-line tools or connect software through a local API Ollama, following its current installer and platform instructions.
Run a model on a specific computer Check that runner’s requirements, then consider RAM, GPU memory, and free disk space together.

The documentation establishes these workflow differences, but does not provide benchmark evidence for a universal performance winner. Hardware support, model catalogs, drivers, and defaults can change; consult the official pages linked above when setting up a particular computer.

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